US8981280B2 - Optical interruption sensor with opposed light emitting diodes - Google Patents
Optical interruption sensor with opposed light emitting diodes Download PDFInfo
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- US8981280B2 US8981280B2 US13/388,505 US201013388505A US8981280B2 US 8981280 B2 US8981280 B2 US 8981280B2 US 201013388505 A US201013388505 A US 201013388505A US 8981280 B2 US8981280 B2 US 8981280B2
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- photosensor
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- photodetector assembly
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Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L31/00—Semiconductor devices sensitive to infrared radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation and specially adapted either for the conversion of the energy of such radiation into electrical energy or for the control of electrical energy by such radiation; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
- H01L31/12—Semiconductor devices sensitive to infrared radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation and specially adapted either for the conversion of the energy of such radiation into electrical energy or for the control of electrical energy by such radiation; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof structurally associated with, e.g. formed in or on a common substrate with, one or more electric light sources, e.g. electroluminescent light sources, and electrically or optically coupled thereto
- H01L31/16—Semiconductor devices sensitive to infrared radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation and specially adapted either for the conversion of the energy of such radiation into electrical energy or for the control of electrical energy by such radiation; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof structurally associated with, e.g. formed in or on a common substrate with, one or more electric light sources, e.g. electroluminescent light sources, and electrically or optically coupled thereto the semiconductor device sensitive to radiation being controlled by the light source or sources
- H01L31/167—Semiconductor devices sensitive to infrared radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation and specially adapted either for the conversion of the energy of such radiation into electrical energy or for the control of electrical energy by such radiation; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof structurally associated with, e.g. formed in or on a common substrate with, one or more electric light sources, e.g. electroluminescent light sources, and electrically or optically coupled thereto the semiconductor device sensitive to radiation being controlled by the light source or sources the light sources and the devices sensitive to radiation all being semiconductor devices characterised by potential barriers
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
- G01D5/00—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable
- G01D5/12—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means
- G01D5/244—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing characteristics of pulses or pulse trains; generating pulses or pulse trains
- G01D5/24471—Error correction
- G01D5/2448—Correction of gain, threshold, offset or phase control
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J1/00—Photometry, e.g. photographic exposure meter
- G01J1/10—Photometry, e.g. photographic exposure meter by comparison with reference light or electric value provisionally void
- G01J1/16—Photometry, e.g. photographic exposure meter by comparison with reference light or electric value provisionally void using electric radiation detectors
- G01J1/18—Photometry, e.g. photographic exposure meter by comparison with reference light or electric value provisionally void using electric radiation detectors using comparison with a reference electric value
Definitions
- the present invention relates to optical sensors and, in particular, to optical interruption sensors that may detect blockage of a beam of light.
- Optical interruption sensors are well known in the art and normally provide an opposed light transmitter, typically a light emitting diode (“LED”), and a light receiver (typically a phototransistor).
- LED light emitting diode
- the light transmitter and receiver may be placed in opposition as supported within a housing.
- the housing provides windows to permit a beam of light to pass from the light transmitter across a slot to the light receiver.
- a light blocking vane for example, a spoke on a rotating wheel or the like, may move into and out of the slot to block or permit passage of the light beam. In this way, detection of the light beam at the light receiver can be used to detect relative movement of the vane with respect to the housing.
- interruption of the light beam detected at the light receiver provides an indication of rotational speed of the wheel.
- the optical-interrupter may include an internal biasing circuit for controlling the brightness of the light transmitter and a detector circuit providing an electrical output (typically a binary signal) indicating whether the light beam is blocked or unblocked based on a pre-established threshold applied to an electrical signal from the light receiver.
- an electrical output typically a binary signal
- the present invention provides an extremely low cost photo-interrupter in which the light transmitter and light receiver are both light emitting diodes.
- the use of two LEDs provides lower-cost than an LED and phototransistor pair both because of the economy of scale of purchasing similar parts and because of the lower cost of LEDs with respect to photo transistors.
- the present invention provides a photosensor-photodetector assembly providing a support defining an unobstructed light path through a gap from a first to a second position, and a solid-state light transmitter and solid-state light receiver attached to the support in the first and second positions so that light from the solid-state light transmitter may be received by the solid-state light receiver.
- the gap is sized to permit an optical blocking element to pass into and out of the gap to block the light from the solid-state light transmitter to the solid-state light receiver and the solid-state light transmitter and solid-state light receiver are both light emitting diodes.
- the light emitting diodes may be selected to produce light of identical light frequency when operated as light emitters.
- the light emitting diodes may, in one embodiment, emit visible red light. Other colors may also be used, including infrared and other visible colors.
- the light emitting diodes may be electrically, optically, and physically identical.
- the photosensor-photodetector assembly may further include biasing circuitry connected to the solid-state light transmitter to provide a predetermined light output from the solid-state light transmitter.
- the photosensor-photodetector assembly may further include detection circuitry connected to the solid-state light receiver providing a two-state output having a first state when the solid-state light receiver receives a first intensity of light provided by unobstructed light from the solid-state light transmitter as biased by the biasing circuitry and having a second state when the solid-state light receiver receives a second intensity of light less than the first intensity of light.
- the detection circuitry may include a comparator and an electrical reference, wherein the comparator receives at one input an electrical signal from the solid-state light receiver having first and second values for the first and second intensities of light the comparator, and receives at another input a reference output value from the electrical reference between the first and second values.
- a given LED batch may be tested and the threshold set eliminating the need for precisely characterized parts.
- the electrical reference and the biasing circuit may provide the predetermined light output and the reference output value, respectively, as a function of a supply voltage to the photosensor-photodetector assembly.
- the comparator may be an integrated circuit differential amplifier.
- the comparator provides an open collector output.
- the support may be a flexible printed circuit board held within a housing bending the flexible printed circuit board into a U-shape with the first and second positions located at ends of the U-shape.
- the support may be a rigid planar printed circuit board cut into a U-shape with the first and second positions located at ends of the U-shape.
- the light emitting diodes may provide a maximum light emitting direction parallel to a mounting surface of the light emitting diode abutting the support surface.
- FIG. 1 is a perspective view, in phantom, of a photo-interrupter of the present invention showing attachment of complementary surface mount LEDs to a flexible circuit board within a housing of the photo-interrupter;
- FIG. 2 is a simplified diagram of the transmitter and receiver of the present invention as may detect an interrupting vane
- FIG. 3 is a schematic of a circuit used in the photo-interrupter of the present invention processing the signal from an LED light receiver to provide a switched output signal;
- FIG. 4 is a perspective view in phantom of an alternative housing for the optical-interrupter.
- an optical-interrupter 10 per the present invention may, in one embodiment, provide a housing 12 having two upwardly extending turrets 14 and 16 opposed across a slot 18 .
- the housing 12 may be constructed at least on part of a transparent thermoplastic material so that light may pass through the opposed facing walls of the turrets 14 and 16 .
- a flexible printed circuit board 20 having a generally T-shaped outline includes wing portions 22 , the center of which may fit beneath the slot 18 with the wing portions 22 bent upward so that ends of the wing portions 22 pass into the turrets 14 and 16 respectively.
- wing portions 22 may support surface-mount LEDs 26 and 27 respectively on their facing surfaces.
- Internal structure of the turrets 16 and 14 guides the wing portions 22 so that the LEDs 26 and 27 are aligned in facing configuration opposed across the slot 18 and along optical axis 30 . As so positioned, light may pass from LED 26 along the optical axis 30 to be received by LED 27 with an axis of highest intensity light emission from LED 26 aligned with the corresponding axis of LED 27 .
- Terminal pins 34 attached to the printed circuit board 20 permit the connection of the optical-interrupter 10 to other devices, for example a home appliance where mechanical motion must be monitored, for example, to determine the rotation of the spin basket in a washing machine.
- the terminal pins 34 permit electrical communication between the components 32 within the optical-interrupter 10 and corresponding circuitry of the external device.
- the terminal pins 34 pass through the housing 12 to be received by a connector (not shown) leading to the external device incorporating the optical-interrupter 10 .
- the housing 12 may include mounting holes 35 or the like for attaching the housing 12 to the device with which the optical-interrupter 10 will be used.
- LED 26 may be configured as a light transmitter, emitting light 36 along axis 30 while LED 27 may be configured as a light receiver, receiving and detecting light 36 along axis 30 .
- a vane 40 may periodically pass into slot 18 across axis 30 to block light 36 , and out of slot 18 away from axis 30 to permit passage of the light 36 thereby changing the amount of light received and detected by the LED 27 .
- LEDs differ from other photo detectors such as photo diodes and phototransistors by their construction and, often, by the materials used in the LEDs.
- LEDs may use direct band gap semiconductor materials (as opposed to indirect band gap semiconductor materials) in forming a PN junction.
- the N-doped material of the PN junction is attached to an opaque support, being either or both of a heatsink or electrical conductor, and light is emitted from the P-doped material.
- the PN junction is normally encased within a light transparent material such as a plastic that is either clear or tinted to match the color of the emitted light.
- the support for the PN junction of the LEDs 26 and 27 may be associated with a reflector element.
- the LEDs 26 and 27 are surface mount devices and the emission or reception direction of the LEDs 26 and 27 along optical axis 30 is generally perpendicular to the mounting surface of the flexible printed circuit board 20 underneath the LEDs 26 and 27 .
- Both LEDs 26 and 27 may be identical electrically, mechanically, and optically (for example, being the same manufacturer part number). In one embodiment, the LEDs 26 and 27 will be designed to produce a red light of the same frequency (e.g., ⁇ 625 nm wave length) if they were biased for use as light emitters. Other colors may also be used, including infrared and other visible colors.
- LED 26 may be given conventional LED biasing by means of a biasing resistor 42 communicating with a positive supply voltage 44 received through one of terminal pins 34 .
- the biasing resistor 42 controls the current flow through the LED 26 from anode to cathode to control an emission of red light from the LED 26 .
- the resistor 42 will define the current through the LED 26 and hence its illumination intensity. With slight changes in the supply voltage 44 , the illumination intensity will also change.
- the emitted light from the LED 26 is received by LED 27 whose conductivity is affected by the amount of received light.
- An electrical biasing of the LED 27 is provided by the inverting input of a comparator 50 which rests at a positive voltage with respect to ground. This positive voltage generates a current passing through resistors 53 to the anode of LED 27 , the cathode of which is grounded.
- Resistor 46 and capacitor 48 may be placed in parallel across the LED 26 to provide a low pass filter improving the signal quality developed by LED 26 by shunting to ground high frequency noise components and by limiting the switching speed of the photo-interrupter to reduce false triggering.
- the comparator 50 compares the voltage at its inverting input, as will be determined by the light received by the LED 27 , to a threshold voltage applied to the non-inverting input of comparator 50 .
- This threshold voltage is established by a conventional resistor voltage divider 52 and will determine the switching point of the comparator 50 and thus the threshold sensitivity of the LED 27 to light.
- the voltage reference provided by the resistor divider 52 will also change with changes in the supply voltage 44 , so as to offset the change in illumination intensity of the LED 26 .
- the threshold voltage may be flexibly adjusted appropriately by changing the relative values of the resistors of the resistor voltage divider 52 which spans the power and ground lines and provides the threshold voltage at the junction of its two resistors. In this way, the threshold voltage may be adjusted for different batches of LEDs 26 and 27 accommodating the fact that their light output and sensitivity may not be well characterized by the part number.
- the voltage threshold may be floating and based on the average signal level from LED 27 , for example obtained from a low pass filter connected to the anode of diode 27 (not shown).
- a resistor 51 may be attached between the output of the comparator 50 and the non-inverting input of the comparator 50 to provide for hysteresis reducing false triggering and promoting stability in the comparator 50 .
- a suitable comparator may be the LM393 comparator, being a low power, low offset voltage comparator implemented as an integrated circuit providing a differential amplifier configuration, and commercially available from National Semiconductor of Santa Clara, Calif., as well as others. This comparator provides an open collector output and may operate with a single ended voltage supply of as little as 2 V.
- a pull-up resistor 54 may attach between the output of the comparator 50 and the positive voltage source 55 , the latter of which may be different from or the same as supply voltage 44 to provide a pull up voltage for the output of the comparator 50 .
- the voltage of the voltage source 55 may be selected independently from the supply voltage 44 so that the output signal amplitude may be flexibly set by the device attached to the optical-interrupter 10 in the manner of a conventional optical-interrupter not having a comparator but using the collector of a phototransistor.
- a filter capacitor 41 may be placed between the supply voltage 44 and ground to provide for improved voltage stability and the resistance to electrical noise.
- a nanofarad stabilizing capacitor 57 may be placed on the output of the comparator 50 for high frequency stability according to techniques known in the art.
- the flexible printed circuit board 20 may be replaced with a conventional rigid printed circuit board 62 constructed, for example, of epoxy and glass fiber.
- This planar circuit board may nevertheless provide a slot 18 by being cut into a U-shape having parallel extending legs 64 flanking the slot 18 .
- the LEDs 26 and 27 may be side-looking LEDs which emit and receive light along axis 30 generally parallel to the surface of the printed circuit board 62 . This is in contrast to the embodiment of FIG. 1 in which the optical axis 30 is perpendicular to the surface of the flexible printed circuit board 20 .
- the LEDs 26 and 27 may include an internal PN junction 67 having an N-channel material mounted directly to an opaque cathode conductor to emit light through the P-junction material along optical axis 30 .
- Terminal pins 34 may be mounted on the printed circuit board 62 to connect by traces to the other components 32 .
- a corresponding U-shaped housing 68 may be constructed for receiving the printed circuit board 62 and the mounted components 32 and may provide for transparent windows 70 on portions of the housing 68 that lie along the optical axis 30 across the slot 18 .
- mounting holes 35 may be provided for mounting the housing 68 and the assembled printed circuit board 62 to a device.
- the printed circuit board 62 may be held within the housing 68 by a cover (not shown) enclosing the housing 68 about the printed circuit board 62 .
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Computer Hardware Design (AREA)
- Condensed Matter Physics & Semiconductors (AREA)
- Electromagnetism (AREA)
- Engineering & Computer Science (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Power Engineering (AREA)
- Spectroscopy & Molecular Physics (AREA)
- Photo Coupler, Interrupter, Optical-To-Optical Conversion Devices (AREA)
- Optical Transform (AREA)
- Geophysics And Detection Of Objects (AREA)
- Photometry And Measurement Of Optical Pulse Characteristics (AREA)
Abstract
Description
Claims (19)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
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US13/388,505 US8981280B2 (en) | 2009-08-03 | 2010-06-17 | Optical interruption sensor with opposed light emitting diodes |
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US23092209P | 2009-08-03 | 2009-08-03 | |
PCT/US2010/038933 WO2011016908A1 (en) | 2009-08-03 | 2010-06-17 | Optical interruption sensor with opposed light emitting diodes |
US13/388,505 US8981280B2 (en) | 2009-08-03 | 2010-06-17 | Optical interruption sensor with opposed light emitting diodes |
Publications (2)
Publication Number | Publication Date |
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US20120138777A1 US20120138777A1 (en) | 2012-06-07 |
US8981280B2 true US8981280B2 (en) | 2015-03-17 |
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US13/388,505 Active 2030-11-29 US8981280B2 (en) | 2009-08-03 | 2010-06-17 | Optical interruption sensor with opposed light emitting diodes |
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US (1) | US8981280B2 (en) |
WO (1) | WO2011016908A1 (en) |
Families Citing this family (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2011016908A1 (en) * | 2009-08-03 | 2011-02-10 | Illinois Tool Works Inc. | Optical interruption sensor with opposed light emitting diodes |
JP6546833B2 (en) * | 2015-10-28 | 2019-07-17 | 株式会社三共 | Game machine and magnetic detector |
JP6372522B2 (en) * | 2016-06-24 | 2018-08-15 | カシオ計算機株式会社 | Optical sensor and drive operation detection device |
JP2018179501A (en) * | 2017-04-03 | 2018-11-15 | 日本精工株式会社 | Proximity sensor |
CN108996169A (en) * | 2018-08-21 | 2018-12-14 | 廷柏(上海)智能科技有限公司 | A kind of material feeding device |
Citations (43)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3822384A (en) * | 1972-03-31 | 1974-07-02 | Philips Corp | Opto-electronic device having coupled emitter and receiver and method of manufacturing same |
US3906240A (en) * | 1974-09-27 | 1975-09-16 | Burroughs Corp | Folding photo-electric detecting device |
US3919546A (en) * | 1974-05-29 | 1975-11-11 | Philips Corp | Apparatus for obtaining an electrical signal from mechanical motion |
JPS58155778A (en) | 1982-03-10 | 1983-09-16 | Ricoh Co Ltd | Photosensor |
US4695720A (en) * | 1984-12-05 | 1987-09-22 | EMR Elektronische Messund Regelgerate Gesellschaft m.b.H. | Optoelectronic incremental measuring system with adjustable LED positioning |
JPS6311888A (en) | 1986-07-02 | 1988-01-19 | Takeshi Ikeda | Transmission type photointerruptor |
US4856011A (en) * | 1985-01-30 | 1989-08-08 | Ricoh Company, Ltd. | Semiconductor laser control circuit |
US4859057A (en) * | 1987-10-13 | 1989-08-22 | Lawrence Medical Systems, Inc. | Oximeter apparatus |
US5015836A (en) * | 1990-02-05 | 1991-05-14 | Bei Electronics, Inc. | Source intensity adjustment apparatus for optical channel |
JPH0343747B2 (en) | 1983-03-24 | 1991-07-03 | Toshiba Battery | |
US5065013A (en) * | 1989-02-21 | 1991-11-12 | Smiths Industries Public Limited Company | Optical encoders using transmitted and reflected light detection having complementary output |
US5075543A (en) * | 1990-05-29 | 1991-12-24 | Xerox Corporation | Light weight paper sensor using fibers |
US5103085A (en) * | 1990-09-05 | 1992-04-07 | Zimmerman Thomas G | Photoelectric proximity detector and switch |
US5144286A (en) * | 1990-08-06 | 1992-09-01 | Allen-Bradley Company, Inc. | Photosensitive switch with circuit for indicating malfunction |
JPH06181335A (en) | 1992-12-14 | 1994-06-28 | Sharp Corp | Optical coupling device |
US5347386A (en) * | 1990-10-17 | 1994-09-13 | International Business Machines Corporation | Control apparatus |
US5393989A (en) * | 1993-08-02 | 1995-02-28 | Motorola, Inc. | Self biased electrically isolated remote switch powered by an optical or acoustic coupling |
JPH07131062A (en) | 1993-10-29 | 1995-05-19 | Nippondenso Co Ltd | Light emitting/receiving element |
JPH08242018A (en) | 1995-03-02 | 1996-09-17 | Hamamatsu Photonics Kk | Transmission type photo-interrupter |
US5804997A (en) * | 1995-09-19 | 1998-09-08 | Fujitsu Limited | Current-to-voltage converting device and light receiver |
US6150946A (en) * | 1996-10-11 | 2000-11-21 | Focke & Co. (Gmbh & Co.) | Monitoring unit with test beam in conjunction with packaging machines |
US6271523B1 (en) * | 1997-12-05 | 2001-08-07 | John D. Weaver | Optical sensor system and method for monitoring consumables |
US6291839B1 (en) * | 1998-09-11 | 2001-09-18 | Lulileds Lighting, U.S. Llc | Light emitting device having a finely-patterned reflective contact |
US6296148B1 (en) * | 1999-03-31 | 2001-10-02 | Marconi Commerce Systems Inc. | Signature pulse generator and method of detecting tampering with a fueling operation |
US20010025917A1 (en) * | 1998-02-20 | 2001-10-04 | Asada Haruhiko H. | Fingernail sensors for measuring finger forces and finger posture |
US6375340B1 (en) * | 1999-07-08 | 2002-04-23 | Patent-Treuhand-Gesellschaft Fuer Elektrische Gluehlampen Mbh | Led component group with heat dissipating support |
US20020100866A1 (en) * | 2001-01-30 | 2002-08-01 | David Butka | Optical position sensor with threshold updated dynamically by interpolation between minimum and maximum levels of output signal |
US6605804B1 (en) * | 1998-03-07 | 2003-08-12 | Robert Bosch Gmbh | Optical sensor |
US6849845B2 (en) * | 2002-02-13 | 2005-02-01 | Em Microelectronic-Marin Sa | Low power integrating circuit for use with a photodetector and optical sensor including such an integrating circuit |
US6870148B2 (en) * | 2002-09-20 | 2005-03-22 | Mitsubishi Electric Research Laboratories, Inc. | LED with controlled capacitive discharge for photo sensing |
US6995360B2 (en) * | 2003-05-23 | 2006-02-07 | Schlumberger Technology Corporation | Method and sensor for monitoring gas in a downhole environment |
US7002771B2 (en) * | 2003-08-19 | 2006-02-21 | Hewlett-Packard Development Company, L.P. | Method and apparatus for sensing position of a tape head in a tape drive |
US7230687B2 (en) * | 2002-05-07 | 2007-06-12 | Chf Solutions Inc. | Blood leak detector for extracorporeal treatment system |
US7256409B2 (en) * | 2004-12-23 | 2007-08-14 | Samsung Electronics Co., Ltd. | Optical sensor circuit combining functions of open and close type optical sensor circuits |
US7265340B2 (en) * | 2004-06-10 | 2007-09-04 | Matsushita Electric Industrial Co., Ltd. | Optical device and method for fabricating the same |
US7291831B2 (en) * | 2004-03-12 | 2007-11-06 | Avago Technologies Ecbuip (Singapore) Pte Ltd | Method and apparatus for automatic modulation of photo-emitter brightness in an optical encoder |
US20090032295A1 (en) * | 2005-04-19 | 2009-02-05 | Denki Kagaku Kogyo Kabushiki Kaisha | Metal base circuit board, led, and led light source unit |
US20090127446A1 (en) * | 2006-03-31 | 2009-05-21 | Avago Technologies General Ip (Singapore) Pte. Ltd | Optical Encoder Apparatus for Removable Connection with Printed Circuit Board and Methods of Assembling Optical Encoder |
US7586078B2 (en) * | 2005-06-20 | 2009-09-08 | Lite-On Technology Corp. | Method for forming a photoelectric switch |
US20100102208A1 (en) * | 2008-10-29 | 2010-04-29 | Guenther Bergmann | Circuit and method for operating a circuit |
US7718942B2 (en) * | 2007-10-09 | 2010-05-18 | Avago Technologies Ecbu Ip (Singapore) Pte. Ltd. | Illumination and color management system |
US7816638B2 (en) * | 2004-03-30 | 2010-10-19 | Phoseon Technology, Inc. | LED array having array-based LED detectors |
US20120138777A1 (en) * | 2009-08-03 | 2012-06-07 | Illinois Tool Works Inc. | Optical interruption sensor with opposed light emitting diodes |
Family Cites Families (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH0343747U (en) * | 1989-09-05 | 1991-04-24 |
-
2010
- 2010-06-17 WO PCT/US2010/038933 patent/WO2011016908A1/en active Application Filing
- 2010-06-17 US US13/388,505 patent/US8981280B2/en active Active
Patent Citations (43)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3822384A (en) * | 1972-03-31 | 1974-07-02 | Philips Corp | Opto-electronic device having coupled emitter and receiver and method of manufacturing same |
US3919546A (en) * | 1974-05-29 | 1975-11-11 | Philips Corp | Apparatus for obtaining an electrical signal from mechanical motion |
US3906240A (en) * | 1974-09-27 | 1975-09-16 | Burroughs Corp | Folding photo-electric detecting device |
JPS58155778A (en) | 1982-03-10 | 1983-09-16 | Ricoh Co Ltd | Photosensor |
JPH0343747B2 (en) | 1983-03-24 | 1991-07-03 | Toshiba Battery | |
US4695720A (en) * | 1984-12-05 | 1987-09-22 | EMR Elektronische Messund Regelgerate Gesellschaft m.b.H. | Optoelectronic incremental measuring system with adjustable LED positioning |
US4856011A (en) * | 1985-01-30 | 1989-08-08 | Ricoh Company, Ltd. | Semiconductor laser control circuit |
JPS6311888A (en) | 1986-07-02 | 1988-01-19 | Takeshi Ikeda | Transmission type photointerruptor |
US4859057A (en) * | 1987-10-13 | 1989-08-22 | Lawrence Medical Systems, Inc. | Oximeter apparatus |
US5065013A (en) * | 1989-02-21 | 1991-11-12 | Smiths Industries Public Limited Company | Optical encoders using transmitted and reflected light detection having complementary output |
US5015836A (en) * | 1990-02-05 | 1991-05-14 | Bei Electronics, Inc. | Source intensity adjustment apparatus for optical channel |
US5075543A (en) * | 1990-05-29 | 1991-12-24 | Xerox Corporation | Light weight paper sensor using fibers |
US5144286A (en) * | 1990-08-06 | 1992-09-01 | Allen-Bradley Company, Inc. | Photosensitive switch with circuit for indicating malfunction |
US5103085A (en) * | 1990-09-05 | 1992-04-07 | Zimmerman Thomas G | Photoelectric proximity detector and switch |
US5347386A (en) * | 1990-10-17 | 1994-09-13 | International Business Machines Corporation | Control apparatus |
JPH06181335A (en) | 1992-12-14 | 1994-06-28 | Sharp Corp | Optical coupling device |
US5393989A (en) * | 1993-08-02 | 1995-02-28 | Motorola, Inc. | Self biased electrically isolated remote switch powered by an optical or acoustic coupling |
JPH07131062A (en) | 1993-10-29 | 1995-05-19 | Nippondenso Co Ltd | Light emitting/receiving element |
JPH08242018A (en) | 1995-03-02 | 1996-09-17 | Hamamatsu Photonics Kk | Transmission type photo-interrupter |
US5804997A (en) * | 1995-09-19 | 1998-09-08 | Fujitsu Limited | Current-to-voltage converting device and light receiver |
US6150946A (en) * | 1996-10-11 | 2000-11-21 | Focke & Co. (Gmbh & Co.) | Monitoring unit with test beam in conjunction with packaging machines |
US6271523B1 (en) * | 1997-12-05 | 2001-08-07 | John D. Weaver | Optical sensor system and method for monitoring consumables |
US20010025917A1 (en) * | 1998-02-20 | 2001-10-04 | Asada Haruhiko H. | Fingernail sensors for measuring finger forces and finger posture |
US6605804B1 (en) * | 1998-03-07 | 2003-08-12 | Robert Bosch Gmbh | Optical sensor |
US6291839B1 (en) * | 1998-09-11 | 2001-09-18 | Lulileds Lighting, U.S. Llc | Light emitting device having a finely-patterned reflective contact |
US6296148B1 (en) * | 1999-03-31 | 2001-10-02 | Marconi Commerce Systems Inc. | Signature pulse generator and method of detecting tampering with a fueling operation |
US6375340B1 (en) * | 1999-07-08 | 2002-04-23 | Patent-Treuhand-Gesellschaft Fuer Elektrische Gluehlampen Mbh | Led component group with heat dissipating support |
US20020100866A1 (en) * | 2001-01-30 | 2002-08-01 | David Butka | Optical position sensor with threshold updated dynamically by interpolation between minimum and maximum levels of output signal |
US6849845B2 (en) * | 2002-02-13 | 2005-02-01 | Em Microelectronic-Marin Sa | Low power integrating circuit for use with a photodetector and optical sensor including such an integrating circuit |
US7230687B2 (en) * | 2002-05-07 | 2007-06-12 | Chf Solutions Inc. | Blood leak detector for extracorporeal treatment system |
US6870148B2 (en) * | 2002-09-20 | 2005-03-22 | Mitsubishi Electric Research Laboratories, Inc. | LED with controlled capacitive discharge for photo sensing |
US6995360B2 (en) * | 2003-05-23 | 2006-02-07 | Schlumberger Technology Corporation | Method and sensor for monitoring gas in a downhole environment |
US7002771B2 (en) * | 2003-08-19 | 2006-02-21 | Hewlett-Packard Development Company, L.P. | Method and apparatus for sensing position of a tape head in a tape drive |
US7291831B2 (en) * | 2004-03-12 | 2007-11-06 | Avago Technologies Ecbuip (Singapore) Pte Ltd | Method and apparatus for automatic modulation of photo-emitter brightness in an optical encoder |
US7816638B2 (en) * | 2004-03-30 | 2010-10-19 | Phoseon Technology, Inc. | LED array having array-based LED detectors |
US7265340B2 (en) * | 2004-06-10 | 2007-09-04 | Matsushita Electric Industrial Co., Ltd. | Optical device and method for fabricating the same |
US7256409B2 (en) * | 2004-12-23 | 2007-08-14 | Samsung Electronics Co., Ltd. | Optical sensor circuit combining functions of open and close type optical sensor circuits |
US20090032295A1 (en) * | 2005-04-19 | 2009-02-05 | Denki Kagaku Kogyo Kabushiki Kaisha | Metal base circuit board, led, and led light source unit |
US7586078B2 (en) * | 2005-06-20 | 2009-09-08 | Lite-On Technology Corp. | Method for forming a photoelectric switch |
US20090127446A1 (en) * | 2006-03-31 | 2009-05-21 | Avago Technologies General Ip (Singapore) Pte. Ltd | Optical Encoder Apparatus for Removable Connection with Printed Circuit Board and Methods of Assembling Optical Encoder |
US7718942B2 (en) * | 2007-10-09 | 2010-05-18 | Avago Technologies Ecbu Ip (Singapore) Pte. Ltd. | Illumination and color management system |
US20100102208A1 (en) * | 2008-10-29 | 2010-04-29 | Guenther Bergmann | Circuit and method for operating a circuit |
US20120138777A1 (en) * | 2009-08-03 | 2012-06-07 | Illinois Tool Works Inc. | Optical interruption sensor with opposed light emitting diodes |
Non-Patent Citations (1)
Title |
---|
ISR for PCT/US2010/038933 dated Nov. 15, 2010. |
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Publication number | Publication date |
---|---|
WO2011016908A1 (en) | 2011-02-10 |
US20120138777A1 (en) | 2012-06-07 |
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